Display device

Abstract

A display device includes: a plurality of signal lines which extend in a zigzag manner in a column direction and to which image signals are supplied, respectively; an insulation film which covers the plurality of signal lines; and a plurality of pixel electrodes which are formed on the insulation film and to which the image signals are input from the plurality of signal lines, respectively. A distance between ones of the pixel electrodes located adjacent to each other in the column direction is equal to or larger than a line width of the signal lines.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This nonprovisional application claims priority under 35 U.S.C. §119 (a) on Patent Application No.2004-28592 filed in Japan on Feb. 4, 2004, the entire contents of which are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a display device such as a liquid crystal display (LCD) device, a plasma display panel (PDP), an inorganic or organic electroluminescent (EL) display device, a light emitting diode (LED) display device, a fluorescent display tube, an electric field emission display device, an electrophoretic display device, and an electrochromic display device. [0004] 2. Description of the Prior Art [0005] A color LCD using a thin film transistor (TFT) is one of active matrix driven LCDs. A color LCD includes a TFT substrate as an active matrix substrate, a counter substrate disposed so as to be opposed to the TFT substrate and including a common ele...

AI Technical Summary

Benefits of technology

[0014] It is therefore an object of the present invention is to suppress the occurrence of such horizontal stripes and improve display quality.

[0015] For example, in the green pixel 7G, difference between the potential influenced by the red pixel source line 5R and the potential influenced by the blue pixel source line 5B occurs, so that horizontal stripes are generated. That is, the occurrence of such horizontal stripes is caused due that a value for a third term in the above-described equation differs between horizontal lines. Therefore, by giving a smaller value for Csd2 in the third term, the value of the third term becomes smaller and thus horizontal stripes can be suppressed.

[0020] In contrast, in the display device of the present invention, part of the signal line 5 extending in the row direction and the pixel electrodes 7 do not overlap when viewed from the top. Thus, the capacitance Csd2 due to the signal line 5 is small. As has been described with reference to FIG. 6, horizontal stripes appear due to difference in an influenced potential between different source lines. Since a potential is influenced by a parasitic capacitance, the parasitic capacitance Csd2 is reduced, so that the influenced potential is reduced and the difference in an influenced potential between different source lines can be reduced. Therefore, an excellent display grade with less horizontal stripes can be obtained.

[0024] As has been described with reference to FIG. 6, the respective potentials of the green pixel 7G1 in the upper row and the green pixel 7G2 in the lower row, which are influenced by the source line 5G, are equal to each other. In contrast, potentials influenced by other source lines 5R and 5B are different from each other, so that horizontal stripes occur. In the display device of the preferred embodiment, the capacitance Csd2 due to the source lines 5R and 5B is small and thus influences of the source lines 5R and 5B to the potentials can be suppressed. Therefore, difference between the respective potentials of the green pixel 7G1 in the upper row of FIG. 6 and the green pixel 7G2 in the lower row of FIG. 6 is reduced furthermore, so that the occurrence of horizontal stripes can be suppressed.

[0025] In another preferred embodiment of the present invention, when viewed from the top, at least part of the signal line and a first pixel electrode to which an image signal is input from the signal line overlap, and the signal line and the second pixel electrode located adjacent to the first pixel electrode with the signal line interposed therebetween do not overlap. In this embodiment, the second capacitance Csd2 can be reduced furthermore, so that the occurrence of horizontal stripes can be suppressed furthermore.

[0030] According to the present invention, the occurrence of horizontal stripes can be suppressed and display quality can be improved.

Problems solved by technology

However, for example, with the LCD with a high aperture ratio using a delta arrangement, the following problem arises.

In this case, luminance difference among pixels in different rows appears as horizontal stripes, so that a uniform display can not be achieved.

Images